2003-06-30 04:53:50 +04:00
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// VectorSet.h
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//
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// Copyright (c) 2003, Ingo Weinhold (bonefish@cs.tu-berlin.de)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// Except as contained in this notice, the name of a copyright holder shall
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// not be used in advertising or otherwise to promote the sale, use or other
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// dealings in this Software without prior written authorization of the
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// copyright holder.
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#ifndef _VECTOR_SET_H
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#define _VECTOR_SET_H
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#include <new>
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#include <stdlib.h>
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#include <string.h>
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#include <SupportDefs.h>
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#include <Vector.h>
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// element orders
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namespace VectorSetOrder {
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template<typename Value> class Ascending;
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template<typename Value> class Descending;
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}
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// for convenience
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#define _VECTOR_SET_TEMPLATE_LIST template<typename Value, \
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typename ElementOrder>
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#define _VECTOR_SET_CLASS_NAME VectorSet<Value, ElementOrder>
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/*!
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\class VectorSet
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\brief A generic vector-based set implementation.
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The elements of the set are ordered according to the supplied
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compare function object. Default is ascending order.
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*/
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template<typename Value,
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typename ElementOrder = VectorSetOrder::Ascending<Value> >
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class VectorSet {
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private:
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typedef Vector<Value> ElementVector;
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public:
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typedef typename ElementVector::Iterator Iterator;
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typedef typename ElementVector::ConstIterator ConstIterator;
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private:
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static const size_t kDefaultChunkSize = 10;
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static const size_t kMaximalChunkSize = 1024 * 1024;
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public:
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VectorSet(size_t chunkSize = kDefaultChunkSize);
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// TODO: Copy constructor, assignment operator.
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~VectorSet();
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status_t Insert(const Value &value, bool replace = true);
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int32 Remove(const Value &value);
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Iterator Erase(const Iterator &iterator);
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inline int32 Count() const;
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inline bool IsEmpty() const;
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void MakeEmpty();
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inline Iterator Begin();
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inline ConstIterator Begin() const;
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inline Iterator End();
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inline ConstIterator End() const;
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inline Iterator Null();
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inline ConstIterator Null() const;
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Iterator Find(const Value &value);
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ConstIterator Find(const Value &value) const;
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Iterator FindClose(const Value &value, bool less);
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ConstIterator FindClose(const Value &value, bool less) const;
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private:
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int32 _FindInsertionIndex(const Value &value, bool &exists) const;
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private:
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ElementVector fElements;
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ElementOrder fCompare;
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};
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// VectorSet
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// constructor
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/*! \brief Creates an empty set.
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\param chunkSize The granularity for the underlying vector's capacity,
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i.e. the minimal number of elements the capacity grows or shrinks
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when necessary.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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_VECTOR_SET_CLASS_NAME::VectorSet(size_t chunkSize)
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: fElements(chunkSize)
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{
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}
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// destructor
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/*! \brief Frees all resources associated with the object.
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The contained elements are destroyed. Note, that, if the element
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type is a pointer type, only the pointer is destroyed, not the object
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it points to.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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_VECTOR_SET_CLASS_NAME::~VectorSet()
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{
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}
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// Insert
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/*! \brief Inserts a copy of the the supplied value.
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If an element with the supplied value is already in the set, the
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operation will not fail, but return \c B_OK. \a replace specifies
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whether the element shall be replaced with the supplied in such a case.
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Otherwise \a replace is ignored.
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\param value The value to be inserted.
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\param replace If the an element with this value does already exist and
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\a replace is \c true, the element is replaced, otherwise left
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untouched.
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\return
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- \c B_OK: Everything went fine.
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- \c B_NO_MEMORY: Insufficient memory for this operation.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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status_t
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_VECTOR_SET_CLASS_NAME::Insert(const Value &value, bool replace)
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{
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bool exists = false;
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int32 index = _FindInsertionIndex(value, exists);
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if (exists) {
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if (replace)
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fElements[index] = value;
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return B_OK;
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}
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return fElements.Insert(value, index);
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}
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// Remove
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/*! \brief Removes the element with the supplied value.
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\param value The value of the element to be removed.
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\return The number of removed occurrences, i.e. \c 1, if the set
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contained an element with the value, \c 0 otherwise.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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int32
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_VECTOR_SET_CLASS_NAME::Remove(const Value &value)
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{
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bool exists = false;
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int32 index = _FindInsertionIndex(value, exists);
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if (!exists)
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return 0;
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fElements.Erase(index);
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return 1;
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}
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// Erase
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/*! \brief Removes the element at the given position.
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\param iterator An iterator referring to the element to be removed.
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\return An iterator referring to the element succeeding the removed
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one (End(), if it was the last element that has been
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removed), or Null(), if \a iterator was an invalid iterator
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(in this case including End()).
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*/
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_VECTOR_SET_TEMPLATE_LIST
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_VECTOR_SET_CLASS_NAME::Iterator
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_VECTOR_SET_CLASS_NAME::Erase(const Iterator &iterator)
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{
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return fElements.Erase(iterator);
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}
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// Count
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/*! \brief Returns the number of elements the set contains.
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\return The number of elements the set contains.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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int32
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_VECTOR_SET_CLASS_NAME::Count() const
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{
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return fElements.Count();
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}
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// IsEmpty
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/*! \brief Returns whether the set is empty.
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\return \c true, if the set is empty, \c false otherwise.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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bool
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_VECTOR_SET_CLASS_NAME::IsEmpty() const
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{
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return fElements.IsEmpty();
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}
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// MakeEmpty
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/*! \brief Removes all elements from the set.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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void
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_VECTOR_SET_CLASS_NAME::MakeEmpty()
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{
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fElements.MakeEmpty();
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}
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// Begin
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/*! \brief Returns an iterator referring to the beginning of the set.
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If the set is not empty, Begin() refers to its first element,
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otherwise it is equal to End() and must not be dereferenced!
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\return An iterator referring to the beginning of the set.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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_VECTOR_SET_CLASS_NAME::Iterator
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_VECTOR_SET_CLASS_NAME::Begin()
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{
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return fElements.Begin();
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}
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// Begin
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/*! \brief Returns an iterator referring to the beginning of the set.
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If the set is not empty, Begin() refers to its first element,
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otherwise it is equal to End() and must not be dereferenced!
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\return An iterator referring to the beginning of the set.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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_VECTOR_SET_CLASS_NAME::ConstIterator
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_VECTOR_SET_CLASS_NAME::Begin() const
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{
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return fElements.Begin();
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}
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// End
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/*! \brief Returns an iterator referring to the end of the set.
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The position identified by End() is the one succeeding the last
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element, i.e. it must not be dereferenced!
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\return An iterator referring to the end of the set.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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_VECTOR_SET_CLASS_NAME::Iterator
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_VECTOR_SET_CLASS_NAME::End()
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{
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return fElements.End();
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}
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// End
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/*! \brief Returns an iterator referring to the end of the set.
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The position identified by End() is the one succeeding the last
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element, i.e. it must not be dereferenced!
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\return An iterator referring to the end of the set.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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_VECTOR_SET_CLASS_NAME::ConstIterator
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_VECTOR_SET_CLASS_NAME::End() const
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{
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return fElements.End();
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}
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// Null
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/*! \brief Returns an invalid iterator.
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Null() is used as a return value, if something went wrong. It must
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neither be incremented or decremented nor dereferenced!
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\return An invalid iterator.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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_VECTOR_SET_CLASS_NAME::Iterator
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_VECTOR_SET_CLASS_NAME::Null()
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{
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return fElements.Null();
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}
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// Null
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/*! \brief Returns an invalid iterator.
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Null() is used as a return value, if something went wrong. It must
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neither be incremented or decremented nor dereferenced!
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\return An invalid iterator.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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inline
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_VECTOR_SET_CLASS_NAME::ConstIterator
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_VECTOR_SET_CLASS_NAME::Null() const
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{
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return fElements.Null();
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}
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// Find
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/*! \brief Returns an iterator referring to the element with the
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specified value.
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\param value The value of the element to be found.
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\return An iterator referring to the found element, or End(), if the
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set doesn't contain any element with the given value.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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_VECTOR_SET_CLASS_NAME::Iterator
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_VECTOR_SET_CLASS_NAME::Find(const Value &value)
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{
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bool exists = false;
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int32 index = _FindInsertionIndex(value, exists);
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if (!exists)
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return fElements.End();
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return fElements.IteratorForIndex(index);
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}
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// Find
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/*! \brief Returns an iterator referring to the element with the
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specified value.
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\param value The value of the element to be found.
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\return An iterator referring to the found element, or End(), if the
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set doesn't contain any element with the given value.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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_VECTOR_SET_CLASS_NAME::ConstIterator
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_VECTOR_SET_CLASS_NAME::Find(const Value &value) const
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{
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bool exists = false;
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int32 index = _FindInsertionIndex(value, exists);
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if (!exists)
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return fElements.End();
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return fElements.IteratorForIndex(index);
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}
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// FindClose
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/*! \brief Returns an iterator referring to the element with a value closest
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to the specified one.
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If the set contains an element with the specified value, an iterator
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to it is returned. Otherwise \a less indicates whether an iterator to
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the directly smaller or greater element shall be returned.
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If \a less is \c true and the first element in the set has a greater
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value than the specified one, End() is returned. Similarly, when \a less
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is \c false and the last element is smaller. Find() invoked on an empty
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set always returns End().
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Note, that the element order used for the set is specified as template
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argument to the class. Default is ascending order. Descending order
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inverts the meaning of \a less, i.e. if \c true, greater values will
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be returned, since they are smaller ones according to the order.
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\param value The value of the element to be found.
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\return An iterator referring to the found element, or End(), if the
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set doesn't contain any element with the given value or a close
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one according to \a less.
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*/
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_VECTOR_SET_TEMPLATE_LIST
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_VECTOR_SET_CLASS_NAME::Iterator
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_VECTOR_SET_CLASS_NAME::FindClose(const Value &value, bool less)
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{
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bool exists = false;
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int32 index = _FindInsertionIndex(value, exists);
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|
|
|
// If not found, the index _FindInsertionIndex() returns will point to
|
|
|
|
// an element with a greater value or to End(). So, no special handling
|
|
|
|
// is needed for !less.
|
|
|
|
if (exists || !less)
|
|
|
|
return fElements.IteratorForIndex(index);
|
|
|
|
// An element with a smaller value is desired. The previous one (if any)
|
|
|
|
// will do.
|
|
|
|
if (index > 0)
|
|
|
|
return fElements.IteratorForIndex(index - 1);
|
|
|
|
return fElements.End();
|
|
|
|
}
|
|
|
|
|
|
|
|
// FindClose
|
|
|
|
/*! \brief Returns an iterator referring to the element with a value closest
|
|
|
|
to the specified one.
|
|
|
|
|
|
|
|
If the set contains an element with the specified value, an iterator
|
|
|
|
to it is returned. Otherwise \a less indicates whether an iterator to
|
2003-07-02 00:36:11 +04:00
|
|
|
the directly smaller or greater element shall be returned.
|
2003-06-30 04:53:50 +04:00
|
|
|
|
|
|
|
If \a less is \c true and the first element in the set has a greater
|
|
|
|
value than the specified one, End() is returned. Similarly, when \a less
|
|
|
|
is \c false and the last element is smaller. Find() invoked on an empty
|
|
|
|
set always returns End().
|
|
|
|
|
|
|
|
Note, that the element order used for the set is specified as template
|
|
|
|
argument to the class. Default is ascending order. Descending order
|
|
|
|
inverts the meaning of \a less, i.e. if \c true, greater values will
|
|
|
|
be returned, since they are smaller ones according to the order.
|
|
|
|
|
|
|
|
\param value The value of the element to be found.
|
|
|
|
\return An iterator referring to the found element, or End(), if the
|
|
|
|
set doesn't contain any element with the given value or a close
|
|
|
|
one according to \a less.
|
|
|
|
*/
|
|
|
|
_VECTOR_SET_TEMPLATE_LIST
|
|
|
|
_VECTOR_SET_CLASS_NAME::ConstIterator
|
|
|
|
_VECTOR_SET_CLASS_NAME::FindClose(const Value &value, bool less) const
|
|
|
|
{
|
|
|
|
bool exists = false;
|
|
|
|
int32 index = _FindInsertionIndex(value, exists);
|
|
|
|
// If not found, the index _FindInsertionIndex() returns will point to
|
|
|
|
// an element with a greater value or to End(). So, no special handling
|
|
|
|
// is needed for !less.
|
|
|
|
if (exists || !less)
|
|
|
|
return fElements.IteratorForIndex(index);
|
|
|
|
// An element with a smaller value is desired. The previous one (if any)
|
|
|
|
// will do.
|
|
|
|
if (index > 0)
|
|
|
|
return fElements.IteratorForIndex(index - 1);
|
|
|
|
return fElements.End();
|
|
|
|
}
|
|
|
|
|
|
|
|
// _FindInsertionIndex
|
|
|
|
/*! \brief Finds the index at which the element with the supplied value is
|
|
|
|
located or at which it would need to be inserted.
|
|
|
|
\param value The value.
|
|
|
|
\param exists Is set to \c true, if the set does already contain an
|
|
|
|
element with that value.
|
|
|
|
\return The index at which the element with the supplied value is
|
|
|
|
located or at which it would need to be inserted.
|
|
|
|
*/
|
|
|
|
_VECTOR_SET_TEMPLATE_LIST
|
|
|
|
int32
|
|
|
|
_VECTOR_SET_CLASS_NAME::_FindInsertionIndex(const Value &value,
|
|
|
|
bool &exists) const
|
|
|
|
{
|
|
|
|
// binary search
|
|
|
|
int32 lower = 0;
|
|
|
|
int32 upper = Count();
|
|
|
|
while (lower < upper) {
|
|
|
|
int32 mid = (lower + upper) / 2;
|
|
|
|
int cmp = fCompare(fElements[mid], value);
|
|
|
|
if (cmp < 0)
|
|
|
|
lower = mid + 1;
|
|
|
|
else
|
|
|
|
upper = mid;
|
|
|
|
}
|
|
|
|
exists = (lower < Count() && fCompare(value, fElements[lower]) == 0);
|
|
|
|
return lower;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// element orders
|
|
|
|
|
|
|
|
namespace VectorSetOrder {
|
|
|
|
|
|
|
|
// Ascending
|
|
|
|
/*! \brief A compare function object implying and ascending order.
|
|
|
|
|
|
|
|
The < operator must be defined on the template argument.
|
|
|
|
*/
|
|
|
|
template<typename Value>
|
|
|
|
class Ascending {
|
|
|
|
public:
|
|
|
|
inline int operator()(const Value &a, const Value &b) const
|
|
|
|
{
|
|
|
|
if (a < b)
|
|
|
|
return -1;
|
|
|
|
else if (b < a)
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
// Descending
|
|
|
|
/*! \brief A compare function object implying and descending order.
|
|
|
|
|
|
|
|
The < operator must be defined on the template argument.
|
|
|
|
*/
|
|
|
|
template<typename Value>
|
|
|
|
class Descending {
|
|
|
|
public:
|
|
|
|
inline int operator()(const Value &a, const Value &b) const
|
|
|
|
{
|
|
|
|
if (a < b)
|
|
|
|
return -1;
|
|
|
|
else if (b < a)
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
} // namespace VectorSetOrder
|
|
|
|
|
|
|
|
#endif // _VECTOR_SET_H
|